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PR rtl-optimization/100263: Ensure register can change mode

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For move2add_valid_value_p we also have to ask the target whether a
register can be accessed in a different mode than it was set before.

gcc/ChangeLog:

	PR rtl-optimization/100263
	* postreload.c (move2add_valid_value_p): Ensure register can
	change mode.
This commit is contained in:
Stefan Schulze Frielinghaus 2021-05-05 17:00:43 +02:00
parent dfd2c92f3f
commit bb283170e7
1 changed files with 2 additions and 1 deletions
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gcc/postreload.c
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@ -1721,7 +1721,8 @@ move2add_valid_value_p (int regno, scalar_int_mode mode)
{
scalar_int_mode old_mode;
if (!is_a <scalar_int_mode> (reg_mode[regno], &old_mode)
|| !MODES_OK_FOR_MOVE2ADD (mode, old_mode))
|| !MODES_OK_FOR_MOVE2ADD (mode, old_mode)
|| !REG_CAN_CHANGE_MODE_P (regno, old_mode, mode))
return false;
/* The value loaded into regno in reg_mode[regno] is also valid in
mode after truncation only if (REG:mode regno) is the lowpart of